These eggs are oval or ellipsoidal, with an operculum at one end that can be inconspicuous. At the opposite (abopercular) end is a small knob that can be barely discernible. The eggs are passed in the stool unembryonated. Size range: 58 to 76 mcm by 40 to 51 mcm.
http://www.dpd.cdc.gov/dpdx/HTML/ImageLibrary/Diphyllobrothiasis_il.html (Centers for Disease Control and Prevention, National Center for Infectious Diseases, Division of Parasitic Diseases. Public domain).
